Gsm Service (At&T, T-Mobile, Rogers); Gsm Packet (Internet) Service - Honeywell CNI2 Operating And Installation Manual

CNI2 Operating and Installation Guide
GSM Service (AT&T, T-Mobile, Rogers)
GSM is an abbreviation for Global System for Mobile communications. This communications
standard is widely used throughout Europe, Africa, Asia and parts of North and South America.
Messages are digitized into packets and sent in brief bursts during allocated time slots using a
variation of TDMA (Time Division Multiple Access) techniques. Up to 8 cellular phones can thus
share the same frequency band, which in turn permits the system to support more users with
existing equipment. Efficient utilization of spectrum is an important consideration for service
providers since there is only a limited bandwidth space that has been allocated to cellular phone
service.
Most GSM systems throughout the world operate on either the 900 MHz or 1800 MHz
communications bands. In North America most GSM systems operate on the 850 and 1900
MHz bands.

GSM Packet (Internet) Service

Some GSM service providers may not offer all forms of data transfer. General packet radio
service (GPRS) may have to be added to a standard voice plan, or may be a stand-alone
service.
GPRS packages are generally priced by the number of bytes to be transferred rather than by
the minute. Typically the smallest available package will be 1 megabyte (1 Mb) per month.
The amount of data that the CNI2 will produce depends upon what sort of data is requested
from it. The amount of information exchanged on each call may range from several hundred
bytes to 10's of thousands of bytes. It may be necessary to test the system for several months
and then adjust the cellular account for the best cost based on your needs.
In order to connect to the Internet, the cellular service provider has its own computer equipment
called a "gateway" server, aptly named, as it is their gateway to the Internet. The server will
have an "APN" (access point name), usually in the form of a domain name such as
"internetaccess.providername.com" or something as simply as "proxy". Contact your service
provider for this information. This APN will be needed when configuring the CNI2.
Service providers may have several different gateways to choose from, depending upon the
type of service required. "Web phones" (cellular phones that support Internet access) are
generally assigned to a gateway that only connects to WAP services (wireless application
protocol). The CNI2 requires full Internet access because the data collection software could be
running on any server located anywhere in the world. Full access gateways are usually
assigned to customers who will be connecting a cellular modem to a personal computer.
Another parameter that will be needed is the packet service connection command. In most
cases the command will be ATD*99# but you may want to check with your service provider.
A cellular account must be activated with a cellular service provider prior to placing a CNI2 into
service. The service provider may ask the device type, which must be specified as the "CNI2 /
GSM24".
88